Transformer oil may not be something you see every day, but it’s one of the most important fluids in keeping electrical equipment safe and running smoothly. It cools transformers, prevents electrical sparks, protects metal parts, and even extends the life of high-voltage machines.
Choosing the right oil can make a huge difference in performance, safety, and efficiency—whether it’s in transformers, switchgear, or industrial machines. At Fubex Lubricants, we offer high-quality transformer oils to keep your electrical equipment safe, cool, and running smoothly. Enjoy fast shipping, a price match guarantee, and easy returns. Need help picking the proper coolant for your car? Call us at +971 50 544 9614 — our friendly team is here to help!
Awais I., Sales Director, says, “Using high-quality transformer oil is key to keeping electrical equipment safe and efficient — it prevents overheating, protects parts, and ensures systems run smoothly for years,”
In this guide, we’ll break down the types of transformer oil, their key properties, and why using the right one matters, along with our top picks to keep your equipment working at its best.
Types of Transformer Oil
Transformer oils help keep transformers cool and working safely. There are three main types you should know about:
Mineral-Based Transformer Oil
This is the most common type of transformer oil. It is made by refining crude oil. Mineral oil is divided into two kinds:
- Naphthenic Oil: This oil cools the transformer very well. It also stays stable even when the temperature changes, which means it doesn’t break down easily.
- Paraffinic Oil: This oil has better oxidation stability than naphthenic oil. That means it can resist aging for a longer time. However, it may not cool the transformer as well as naphthenic oil.
Mineral-based oils are easy to find and are usually cheaper than other types of transformer oils.
Synthetic Transformer Oil
Synthetic oil is man-made. It performs better than regular mineral oil, especially when the transformer works under very high voltage. These oils have:
- Strong thermal stability
- Good resistance to oxidation
- A longer life compared to mineral oil
Synthetic oils cost more, but they are recommended when high reliability and long-term performance are the main priorities.
Natural Ester and Biodegradable Oils
These oils are made from natural, renewable sources like vegetable oils. They are eco-friendly and biodegradable. Natural ester oils are:
- Great insulators
- Less likely to catch fire
- Safe to use in areas that care about the environment, such as cities or nature-sensitive zones
They are also used in applications like hydraulic systems and heat transfer because of their safety and stability.
Key Properties of Transformer Oil
Transformer oil has several important features that help a transformer work safely and smoothly. Here are the main ones:
Electrical Properties
Transformer oil resists electrical discharge very well. This means it helps prevent sparks or electrical failures, even when the transformer is working at high voltage. Because of this, the oil helps protect and insulate the important parts inside the transformer.
Thermal Properties
Transformers heat up while working, and the oil helps remove this heat. Transformer oil cools quickly because it has:
- Good thermal conductivity (T.C.) — it can move heat away fast
- Low viscosity — it flows easily
These features help stop the transformer from overheating and keep it working at its best.
Chemical Properties
Transformer oil is chemically stable, which means it does not break down easily. It also resists oxidation, so it lasts longer. Mineral-based oils usually have special additives that stop sludge from forming, helping the oil stay clean and useful for a longer time.
Physical Properties
Transformer oil has:
- Low moisture content
- Good viscosity
- A high flash point (it does not catch fire easily)
Because of these physical qualities, the oil is great for cooling, insulating, and protecting electrical equipment.
Uses and Applications of Transformer Oil
Transformer oil is very important for keeping transformers and other electrical devices safe and working well. Here’s how it helps:
Insulation in Transformers
Transformer oil acts like an insulating fluid. It stops unwanted electrical discharges inside the transformer. This helps the transformer work smoothly and protects the equipment so it lasts longer.
Cooling and Heat Dissipation
Transformers produce a lot of heat when they run. Transformer oil absorbs this heat and carries it away, helping the equipment stay cool. This prevents overheating and keeps the transformer working safely.
Preventing Corrosion and Oxidation
Transformer oil also protects the metal parts inside the transformer. It slows down corrosion (rusting) and oxidation, which keeps the internal parts strong and in good condition for many years.
Use in Other Electrical Equipment
Transformer oil is not only used in transformers. It is also used in:
- High-voltage switches
- Circuit breakers
- Capacitors
In these devices, it works as both a cooling fluid and an insulating fluid, making it useful for many types of electrical systems.
Why Choosing the Right Transformer Oil Matters
Picking the right transformer oil is very important if you want your transformer to work well and last a long time. The type of oil you choose can affect how efficient, safe, and reliable your transformer is. Here are the main reasons why choosing the right oil matters:
Better Insulation
Good transformer oil has strong insulation power, also called high dielectric strength. This means it can stop electricity from jumping or causing a short circuit inside the transformer. When the insulation is strong, the transformer stays safer and works better.
Good Heat Transfer
Transformers create a lot of heat while working. The right oil helps move this heat away from the core and windings. Oils with good thermal conductivity cool the transformer faster and prevent overheating.
Long-Term Stability
Quality transformer oil does not break down quickly. It has:
- Good Oxidation Stability — it can handle exposure to oxygen without forming harmful sludge
- Strong Aging Resistance — it keeps its properties for a long time
This means the oil stays clean and effective even after years of use.
Safe for Transformer Materials
Transformer oil must work well with the materials inside the transformer—like insulation paper, rubber seals, gaskets, and paint coatings. If the oil is compatible, it won’t damage these parts or cause them to wear out faster.
Why the Right Choice Matters
When operators choose the correct transformer oil, they help:
- Improve the transformer’s efficiency
- Reduce the risk of failures
- Keep the equipment safe
- Extend the overall lifespan of the transformer
So, it’s important to look at factors like dielectric strength, thermal conductivity, oxidation stability, aging resistance, and compatibility when selecting transformer oil. Making the right choice keeps the transformer working smoothly and protected from heat, electrical problems, and contamination.
Best Transformer Oil: Our Top Picks
Discover the best transformer oils that keep your equipment running safely, efficiently, and longer than ever. Don’t miss our top picks—they’re tested, trusted, and designed to protect your transformers every day.
Fubex Electrax 10 Transformer Oil
Meet the Fubex Electrax 10 Transformer Oil—a smart choice for keeping your electrical systems safe, cool, and running at their best. This high-quality oil helps stop short circuits, protects transformer parts, and keeps everything working smoothly. It absorbs heat fast, prevents overheating, and stays effective for years when properly maintained. Some versions are even biodegradable, making them a safer choice for the environment.
Whether it’s for insulation, cooling, or lubrication, Fubex Electrax 10 is built to boost performance in transformers, cables, and industrial machines—so your equipment stays strong, steady, and reliable.
Fubex Electrax 25 Transformer Oil
Your search for a powerful, reliable transformer oil ends with Fubex Electrax 25. Made from high-quality base oil and boosted with special additives, it delivers strong electrical insulation and fast heat transfer to keep transformers running safely. It doesn’t catch fire easily, stays liquid even in cold weather, and doesn’t break down when chemicals or high temperatures come into play.
Electrax 25 also protects metal and rubber parts, keeping the whole system steady and long-lasting. With its ability to resist water, acid, and aging, this oil keeps your transformer performing at its best—day after day.
Fubex Electrax 40 Transformer Oil
The Fubex Electrax 40 Transformer Oil is a customer favorite — and it’s easy to see why. This powerful insulating oil keeps high-voltage equipment safe by cooling transformer parts and stopping sparks before they cause damage. Its strong oxidation resistance prevents gunk from building up, even in high heat, so your equipment lasts longer.
It also protects wires, reduces energy loss, and keeps everything running smoothly. Perfect for transformers, switchgear, circuit breakers, tap changers, and more — Electrax 40 delivers safety, strength, and steady performance every day.
Fubex Electrax 45 Transformer Oil
Make your electrical equipment perform at its best with Fubex Electrax 45 Transformer Oil. This high-quality mineral oil stays liquid even in cold temperatures, stops electricity from leaking, and flows smoothly to transfer heat fast.
It won’t harm metal parts, has a high flash point for safer use, and works perfectly with transformer materials. From transformers to switchgear, Electrax 45 keeps your systems cool, protected, and running safely every day.
Fubex Electrax Transformer Oil
That wraps up why Fubex Electrax Transformer Oil is a smart choice for safer, smoother transformer performance. This refined mineral oil has strong electrical insulation, works perfectly even in cold weather, and stays stable for a long time without breaking down.
It’s safe to use with copper, gentle on insulation materials, and passes all key safety tests. Whether used in transformers, switches, or outdoor electrical systems, Electrax keeps everything protected and running reliably.
Final Takeaways
Transformer oil is one of the most important fluids used in transformers and other high-voltage machines. It helps these devices work safely, smoothly, and for many years. By checking and maintaining the oil regularly, industries can boost performance, improve safety, and reduce environmental risks.
Proper monitoring also helps prevent costly breakdowns, making transformer oil a key part of today’s power systems.
FAQs
Q1: How often should transformer oil be tested?
Transformer oil should be tested at least once a year for things like electrical strength, moisture, and chemical condition. Regular testing helps spot problems early and keeps transformers working efficiently.
Q2: Is it possible to recycle transformer oil?
Yes! Transformer oil can be recycled through processes like filtration, dehydration, and degassing. Recycling helps restore its properties, extends its life, and reduces the need for frequent replacement.
Q3: What happens if transformer oil degrades?
When transformer oil degrades, it can’t insulate or cool properly. This may lead to overheating, electrical sparks, and even transformer failure. Regular maintenance and timely replacement help prevent these problems.
Editor-at-Large
A passionate writer in the lubricant industry, Awais Iqbal has been covering oils, greases, and industrial fluids since the start of his career. At 25, he’s already written for blogs, catalogs, and brand guides across the UAE. Awais’s insights help companies connect with their audience, and his clear, helpful writing style is trusted by brands in the region.
